Well, about its history there are lots of interpretations and theories... pick one! The solar is probably the most expanded. (in principle the lauburu symbolizes sun/life when rotating clockwise and moon/death when rotating anticlockwise).
As for the current situation in basque society, the lauburu is commonly accepted to symbolize ancient basque culture. Or to appear in any product intended to be sold to tourists, specially in the french side of the country.
Apart from its cultural meaning, the lauburu is just nice, I find, from a stetical point of view. It suggested smooth flow, doesn it?I also used to wear a silver lauburu necklace. until I came to live in Germany: the lauburu looks similar to the svastica (they probably share a common origin) and I didn´t feel like having to given explanations again and again: "no, no, really, it's not!".